| Package | Description | 
|---|---|
| com.itextpdf.kernel.pdf.layer | 
| Modifier and Type | Method and Description | 
|---|---|
| PdfVisibilityExpression | PdfLayerMembership. getVisibilityExpression()
             Gets the visibility expression for content belonging to this optional content membership dictionary. 
            | 
| Modifier and Type | Method and Description | 
|---|---|
| void | PdfVisibilityExpression. addOperand(PdfVisibilityExpression expression)
             Adds a new opeand to the current visibility expression. 
            | 
| void | PdfLayerMembership. setVisibilityExpression(PdfVisibilityExpression visibilityExpression)
             Sets the visibility expression for content belonging to this membership dictionary. 
            | 
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